It may seem easy to get pregnant, but it really isn't. When I tried having a kid for the first time, it took us 4 months for her to finally become pregnant. The kid is like a little miracle, you're happy you're gonna have it. Usually when one has a baby (well maybe not anymore) you're in a good financial state, and are in a good point of life where it's okay to bring life in this world. Thus your peers, who some know about trying to get pregnant and the preparations for the baby, congratulate you on the new addition to the family.